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Our next step is to review the history of these compressors. During your review of the failure history, we discover that on average each compressor has experienced two valve replacements every year and therefore each one is down twice a year. A review of the valve failure data indicates that failures are time dependent, which suggests that valve monitoring may make sense as a way to mitigate the impact of a failure by allowing the process to better plan outages. There are no other significant compressor failure modes of interest. Furthermore, the synchronous electric motor drivers have demonstrated they can easily run between unit turnarounds without any need for maintenance. It is clear by reviewing the historical data that valve failures control the overall reliability of these machines. Interviews with operators indicate that there seems to be an acceptance that valve failures are the norm and that they have learned to live with the valve problems.